body {
    margin: 0;
    padding: 0 100px;
    background-color: #ccc;
}

.parent_one {
    display: flex;
    justify-content: space-between;
}
.parent_two {
    margin-top: 100px;
    display: flex;
    justify-content: space-between;
}
.parent_three {
    margin-top: 100px;
    display: flex;
    justify-content: space-between;
}

.parent_four {
    margin-top: 100px;
    display: flex;
    justify-content: space-between;
}

.parent_five {
    margin-top: 100px;
    display: flex;
    justify-content: space-between;
}

.parent_six {
    margin-top: 100px;
    display: flex;
    justify-content: space-between;
}